What is post-quantum cryptography and why does it matter?

Post-quantum cryptography refers to cryptographic algorithms designed to resist attacks from quantum computers. It matters because quantum computers could break current encryption methods like RSA and ECC, exposing sensitive data. Organizations must transition to quantum-resistant algorithms now to protect long-term data security. NIST has standardized algorithms like CRYSTALS-Kyber and CRYSTALS-Dilithium to address this threat.

When should businesses start implementing post-quantum cryptography?

Businesses should start implementing post-quantum cryptography immediately. The transition requires years of planning, testing, and deployment across systems. Threat actors are already harvesting encrypted data today to decrypt later when quantum computers become available—a threat known as "harvest now, decrypt later." Early adoption ensures data remains secure against future quantum threats and maintains regulatory compliance.

How does post-quantum cryptography affect existing IT infrastructure?

Post-quantum cryptography requires updating cryptographic libraries, protocols, and hardware across your IT infrastructure. Legacy systems may need replacement or significant modification to support larger key sizes and new algorithms. Performance impacts vary—some quantum-resistant algorithms require more processing power and bandwidth. Organizations need comprehensive audits to identify cryptographic dependencies and plan phased migration strategies that minimize disruption.

What are the main post-quantum cryptography standards businesses should follow?

NIST published the first post-quantum cryptography standards in 2024, including CRYSTALS-Kyber for encryption and CRYSTALS-Dilithium for digital signatures. Additional standards like FALCON and SPHINCS+ provide alternative signature schemes. The NSA's Commercial National Security Algorithm Suite 2.0 also specifies quantum-resistant requirements. Organizations should align with these standards to ensure interoperability, regulatory compliance, and long-term security across global operations.